Wow, the other night as I was waiting outside Forever 21 with the kids while my wife was choosing clothes to send to Mozambique, I began chasing them around. It was close to closing and almost no one was around. I had put on some relatively thin deck shoes from Target to avoid embarrassing my wife at the Mall, and noticed I was heel-striking as I chased my kids. I corrected to a forefoot landing and it didn't feel that natural with shoes on. So I guess what everyone says about shoes and heel-striking is true, I no longer have to take their word for it.